Magnetostratigraphy of the Ordovician Angara/Rozhkova River section: Further evidence for the Moyero reversed superchron |
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| Authors: | V E Pavlov R V Veselovskiy A V Shatsillo Y Gallet |
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| Institution: | 1.Schmidt Institute of Physics of the Earth,Russian Academy of Sciences,Moscow,Russia;2.Institute de Physique du Globe de Paris,Paris,France |
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| Abstract: | We present new magnetostratigraphic results obtained from a well-dated Ordovician key section located along the Angara River,
near the terminus of the Rozhkova River (southern Siberian platform). More than 220 samples were thermally demagnetized up
to 670°C in order to isolate their characteristic ancient magnetization. Samples from the Arenig, the Llanvirn and the Llandeilo
stages are all (but two) of reversed magnetic polarity. In contrast, samples dated of the Caradoc yield a sequence of several
magnetic polarity intervals. These new data therefore confirm the occurrence of a long reversed magnetic polarity interval
during the Ordovician, the so-called Moyero superchron, which ended during the middle or late Llandeilo. |
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